Inductance system



June 10, 1930. Q A. M. TROGNER 1,763,278

INDUCTANCE SYSTEM Filed Dec. 22, 1928 2 Sheets-Sheet 1 A. M. TROGNER INDUCTANCE SYSTEM June 10, 1930.

Filed Dec. 22, 1928 2 Sheets-Sheet 2 Patented June 10, 1930 UNITED STATES PATENT OFFICE ARTHUR H. TROGNER, 01 EAST ORANGE, NEW JERSEY, ASSIGNOR T0 WIRED RADIO, INC., OF NEW YORK, N. Y., A CORPORATION OF DELAWARE 'INDUCTANCE SYSTEM Application filed December 22, 1928.

This invention relates broadly to electrical apparatus and more specifically to improvements in variable inductances whereby the frequency characteristics of inductances may be readily changed.

An object of this invention is to provide an inductance unit the effective value of which may be readily varied.

Another object of this invention is to provide an inductance unit in which connections betweenpredetermined points may be readily established or changed.

A further object of this invetnion is to provide an inductance unit for use in radio transmission systems whereby frequency changing in such systems is facilitated.

Further objects and features of this invention will be apparent to those skilled in the art from the following specification and the appended claims.

In inductance systems employed in various electrical circuits it is often desired to change the value of the inductance in use very rapidly. It is especially desirable to be able to perform this change in the value of effective inductance in one operation without the necessity of removing the inductance unit and substituting another unit therefor. In this invention I provide an arrangement whereby any portion of an inductance unit may be connected into circuit simply by turning a member with which the inductance contacts are associated. This invention is especially useful in radio transmitting systems which are to be employed for signaling on a multiplicity of frequencies since it enables the operator to change from one predetermined frequency to another in one operation slmply by increasing or decreasing the efiective 1nductance in the oscillatory circults.

Referring briefly to the drawings, Figure 1 is a perspective view of a preferred form of my invention; Fig. 2 is a fragmentary view of an inductance showing the turn selector member embodying this invention; Fig. 3 1s a sectional end view of an inductance illustrating this invention; and Fig. 4 illustrates a modification in this invention. Similar reference characters denote like parts throughout all the figures of the drawing.

Serial No. 327,934.

In Fig. 1 of the drawing 1 designates an inductance such as is commonly employed in electrical circuits especially in oscillatory circults of radio signalling systems. 111-: ductance turn selecting members 4, 5, 6, 7 and 8,9, 10, 11 are mounted upon metallic, preferably copper or brass, members 2 and 3 respectively. Turn selecting members 4, 5, 6, 7, 8, 9, 10 and 11 are provided with protrudmg tongues 22, 23, 24, 25, 26, 27, 28 and 29, respectively.

Inductance turn clips or engaging members 12, 13, 14, 15, 17, 18,19 and 20 are aligned to engage the tongues 22, 23, 24, 25, 26, 27, 28 and 29. Rotating members or pulleys 30, 31 and 32 preferably of insulating material are attached to insulating rods 3, 2 and 36, respectively. Insulating rods 3, 2 and 36, are attached to the bars 3, 2 and 36. An actuating member 33 is attached to the rotating member 32. A flexible belt member of insulating material is provided to engage the members 30, 31 and 32. Other arrangements may be employed for actuating the rods 2, 3 and 36 in place of the belt and pulley arrangement shown, for example, a pinion and rack arrangement or a fiber gear system may be used equally well.

When the actuating member 33 is rotated, members 30, 31 and 32 are actuated and the members 2, 3 and 36 are caused to turn. The protruding tongues which are carried by the turn selecting members are caused to successively contact with the inductance turn clips. The proper number of turns of the inductance may be thus readily included in any circuit which is connected to the members 2, 3 and 36. For example, the member 3 is rotated counter-clockwise, the tongue 29 engages the inductance turn clip 20 and establishes electrical connection therewith, if the bar 3 is rotated further the connection between tongue 29 and the clip 20 is broken and connection between the tongue 28 and the clip 19 is established. This operation may be continued and successive tongues and clips caused toengage until the proper number of turns of the inductance unit are included in the circuit.

The arrangement illustrated in Fig. 1 is shown as confined to a single inductance unit, however it is to be understood that the flexible member 3% may be caused to engage rotating members or pu leys similar to 30, v1 and 32 of other inductance units and gang control of a plurality of inductance units obtained. For example, the inthictance units of the master oscillator and a bank of power amplifiers may be controlled simultaneously by employing my invention. i

In Fig. 2 of the drawing the details of construction oi the prei'errec form of this invention are illustrated. The member is provided with a contacting member 37. The contacting member 37 is provided with an angularly dispo; d peripheral flange which bears against a flat conductor 38 and make. electrical contact therewith. The conductor 38 may be (Ollilcudtl into the electrical circuit in various ways well known in the art. The conductor 38 bears against the panel 35 and may be attached thereto to insure eflicient electrical connection between the conductor 38 and the contacting member An adjusting screw 37 provided for the member 37 to provide means whereby this member 37 may be adjusted with respect to the member 2 and to permit the tension of the peripheral flanges against the conductor 38 to be adjusted. Members similar to contacting member 3? are also provided for the elongated members 3 and 36.

In Fig. 3 the manner in which the contacts engag the inductance turn clips is illustrated in deail. Reference char cters 15, 58 and 42 designate turn clips disposed at spaced intervals about the turns of the inductance and in alignment with turn selecting members 7, 11' and 43. Screws 39. and il are employed to secure the turn clips 15, 58 and i2 respectively.

he members 2, o and an are disposed about the inductance in such a manner that the tongues protruding from the turn selecting members may be made to engage the inductance turn clips readil v' in predetermined order by turning. For eX ample, on the member 2 the order in which the tongues eng the turn clips may be as follows: .40 21, 22', 23 and 2%. Similar predetermined order of engagement may be establi bed on the member 3 and 36. A de tad oi (5(1H=Ifll(fti0fl which permits the control ality oft inductance units simultane- .AHYEI in Fig. In this .[igure reference cln. actor denotes an insulating member connecting two barshaped members 49 and 51 which are similar to bar shaped member 2, 3 or 36 of Fig. 1. Turn selecting mem bers and 57 having turn clip engaging tongues and and set screws 5% and 56, respectively, are disposed upon the bar shaped member 51 in alignment with turn clips similar to 12 of Fig. 2 which are dis posed upon the inductance 1. Similar turn selecting members (not shown) are provided 'tor the bar shaped member 49. The winding of the inductance lextends (not shown) along the bar shaped member 49. The bar shaped member 51 may then be used as a means to connect av circuit of one thermionic electron tube operating in a push pull circuit arrangen'icnt to the imluctance 1 while the bar at bed member 49 may be employed to con- .t' a circuit of the other tube operating in the push pull circuit arrangement .to the inductance 1.

While I have described my invention in certain preferred embodiments I desire that it be understood that various other modifications may be made and that no limitations upon my invention are intended other than are imposed by the scope of the appended claims.

Yihat I claim new and desire to secure by Letters Patent of the United States is as follows:

1. In ap )aratus of the class described the combination of, an inductance unit, clips mounted at predetermined positions upon the turns of said inductance unit, members positioned adjacent to said inductance unit, and means mounted upon said members for engaging said clips in predetermined sequence.

2. In apparatus of the class described the combination of, an industance unit, clips mounted at predetermined positions upon the turns of said inductance unit, rotatable members positioned adjacent to said inductance unit, means for rotating said members, and means positioned upon said members for engaging said clips in predetermined sequence.

3. In apparatus of the class described the c mibination of, an inductance unit, clips positioned at predetermined positions and spaced intervals on the turns of said inductance unit, means for engaging said clips and making electrical connection therewith, and means for supporting and actuating said first named means for engaging said clips in pred ctermined order.

In apparatus of the class described the combination of, an inductance unit, clips positioned at predetermined positions upon said inductance unit, rotatable means adjacent each Or said clips for engaging and making electrical. contact therewith, and means for supporting and rotating said rotatable means for engaging and disengaging said clips therewith.

In apparatus of the class described the combination of, an inductance unit, clips positioned in alignment along said inductance, a rotatable member supported adjacent to said inductance, inductance turn selecting means mounted upon said rotatable member adjacent to each of said clips, and means for rotating said member for engaging said first mentioned means and said clips in predetermined order.

6. In apparatus of the class described, the combination of, an inductance comprising a plurality of turns of electrical conductor, a plurality of clips engaging said inductance at predetermined positions, said clips being positioned in rows along said inductance in axial alignment therewith, turn selecting means mounted adjacent each of said clips, and means for actuating said turn selecting means in predetermined order and establishing electrical contact between selected clips and said turn selectin means.

7. In a device of t e class described the combination of, an inductance unit, clips engaging the turns of said inductance unit at predetermined positions, said clips being disposed in a row in axial alignment of said inductance, a member disposed adjacent to said inductance parallel to said row of clips,

means disposed at predetermined positions upon said member for engaging said clips in sequence, a panel for rotatably supporting one end of said member in position, and means mounted upon said member adjacent to said panel for making sliding electrical contact with said member.

8. In a device of the class described, the combination of, an inductance, a plurality of rotatable shaft members extending longitudinally with respect to said inductance, contact members connected to individual turns of said inductance contact members carried by said shafts for establishing connection With selected turns of said inductance, a panel, said shaft members projecting through said panel, rotatable means, control means mounted upon said panel member and engaging said rotatable means for selectively connecting the contact members on said shafts with the contact members on the turns of said inductance.

In a device of the class described the combination of an inductance mounted adjacent to a panel, a plurality of rows of clips engaging turns of said inductance and arranged axially of said inductance, members mounted upon said panel, each of said members being parallel to a row of said inductance clips, means for rotating said members simultanenously, and means for engaging said clips positioned upon said members adjacent to each of said clips, said last named means being adapted to engage and disengage said clips during rotation of said members.

ARTHUR M. TROGNER. 

